Ventilation device for heating ventilation air conditioner

Abstract

The ventilation device for the heating ventilation air conditioner comprises a pipeline, the upper surface of the interior of the pipeline is provided with a penetrating type insertion opening, the interior of the insertion opening is movably connected with a top cover plate, the top cover plate is used for blocking the insertion opening, and the lower surface of the top cover plate is connected with a filter screen; the lower surface of the filter screen is in contact with the lower surface in the pipeline, a cleaning plate is movably connected in the pipeline, a brush is arranged on one side, facing the filter screen, of the cleaning plate, and when the cleaning plate moves back and forth in the pipeline, the brush is in contact with the filter screen to clean the filter screen; by controlling the brush to move back and forth on the outer side of the filter screen, automatic cleaning of the filter screen in the using process of the ventilation device is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning and ventilation, and in particular to a ventilation device for heating, ventilation and air conditioning. Background Art

[0002] HVAC is an integral part of a building. Its full name in subject classification is heating, gas supply, ventilation and air conditioning engineering, which includes three aspects: heating, ventilation and air conditioning. Functionally, it is also an indispensable part of future families. Air is supplied to the HVAC system through air supply devices, and ventilation devices improve the indoor air environment by ventilation.

[0003] The filter components in existing HVAC ventilation devices cannot perform self-cleaning during use. As the use time increases, dust and other impurities will continue to accumulate on the filter components, thereby reducing the efficiency of dust filtration and affecting the air purification effect of the HVAC system. At the same time, the filter components in existing HVAC ventilation devices are generally located inside the pipeline and are not easy to disassemble and maintain later, which increases the workload of later maintenance and reduces the practicality and convenience of the device. Summary of the invention

[0004] An object of the present invention is to provide a solution to the problem that the filter components in the existing HVAC ventilation devices cannot be self-cleaned during use; another object of the present invention is to provide a solution to the problem that the filter components in the existing HVAC ventilation devices are generally located inside the pipeline and are not easy to disassemble and maintain later.

[0005] To achieve the above objectives, the technical solution of the present invention is:

[0006] A ventilation device for HVAC comprises a pipe, wherein a through-type plug port is provided on the inner upper surface of the pipe, a top cover plate is movably connected to the inner part of the plug port, the top cover plate is used to block the plug port, a filter screen is connected to the lower surface of the top cover plate, the lower surface of the filter screen contacts the inner lower surface of the pipe, a cleaning plate is movably connected to the pipe, a brush is arranged on the side of the cleaning plate facing the filter screen, and when the cleaning plate moves back and forth in the pipe, the brush contacts the filter screen to clean the filter screen.

[0007] Furthermore, a positioning block is provided on the inner lower surface of the pipe and on one side of the filter screen, a slide groove is provided on the upper surface of the positioning block, the inner front surface and the inner rear surface of the slide groove are commonly connected with a slide rod, the sliding block is movably sleeved on the slide rod, a cleaning plate is fixedly connected to the upper surface of the sliding block, the upper surface of the cleaning plate is slidably connected to the inner upper surface of the pipe, a brush is fixedly connected to the left side of the cleaning plate, and a through-type limiting circular hole is provided on the front surface of the cleaning plate.

[0008] Furthermore, a control motor is connected to the front surface of the pipe, a rear end of the output shaft of the control motor is connected to the front end of a rotating column, a guide rail groove is integrally formed on the outer side wall of the rotating column, the rear end of the rotating column passes through the limiting circular hole, a roller follower is fixedly connected to the inner lower surface of the limiting circular hole, and the upper surface of the roller follower is in contact with the inner side wall of the guide rail groove.

[0009] Furthermore, an extrusion cavity is provided on the inner left side and the inner right side of the top cover plate, and the interiors of the two extrusion cavities are slidably connected with a piston plate 1, and the opposite sides of the two piston plates 1 are fixedly connected with an oblique plate, and the opposite sides of the two oblique plates are in contact with the inner side wall of the plug interface, and the outer side wall of the top cover plate is fixedly connected with two air bags, and the inner lower surfaces of the two extrusion cavities are respectively connected with the two air bags through air grooves, and the outer side walls of the two air bags are in contact with the inner side wall of the plug interface.

[0010] Furthermore, return springs are connected between the opposite sides of the two piston plates and the two extrusion chambers respectively.

[0011] Furthermore, the inner upper surface and the lower surface of the two extrusion chambers and the opposite sides of the two piston plates are connected with limiting strips.

[0012] The cam is connected with the control gear of the control chamber through a rotation axis, and the control gear is connected with the control gear of the control chamber through a rotation axis, and the control gear is connected with the control gear of the control chamber through a rotation axis.

[0013] Furthermore, a handle is fixedly connected to the upper surface of the top cover plate and located in front of and behind the rotating handle.

[0014] Furthermore, an observation window is provided on the front surface of the pipe.

[0015] Furthermore, a collecting box is fixedly connected to the lower surface of the pipeline, the upper surface of the collecting box extends to the right side of the filter screen, and the lower surface of the collecting box is provided with a cleaning port.

[0016] The beneficial effects of the present invention are:

[0017] By setting a control motor to drive the rotating column to rotate, the rotation of the rotating column is converted into the linear movement of the cleaning plate, so that the brush can be controlled to move back and forth on the outside of the filter, thereby realizing automatic cleaning of the filter during the use of the ventilation device, effectively solving the problem that the filter components in the existing HVAC ventilation device cannot be self-cleaned, ensuring that the filter always maintains a high filtration efficiency. With the continuous cleaning of the filter, it can more effectively intercept pollutants such as dust and impurities in the air, thereby significantly improving the quality of indoor air and providing people with a cleaner and healthier indoor environment.

[0018] The operator can control the extension and retraction of the plug rod by rotating the handle to fix and unlock the top cover. The operator can regularly pull the filter out of the pipe through the top cover for operation. At the same time, the air bag controls its expansion and contraction through the squeezing and extension of the two oblique plates, which can further enhance the sealing and stability between the top cover and the plug interface, making the installation and disassembly of the filter assembly very simple and quick, without the use of complicated tools and equipment, greatly improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a partial cross-sectional structural schematic diagram of the pipeline of the present invention.

[0021] Figure 3 It is a schematic diagram of the top structure of the cross section of the top cover plate of the present invention.

[0022] Figure 4 It is a schematic diagram of the side section structure of the cleaning plate of the present invention.

[0023] Figure 5 The present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Figure 6 The present invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0025] Figure 7 The present invention Figure 2 Schematic diagram of the enlarged structure at point C in the middle.

[0026] Figure 8 It is a schematic diagram of the control chamber and the compression chamber arranged in the top cover plate of the present invention.

[0027] In the figure: 1. Pipe; 2. Mounting plate; 3. Fan assembly; 4. Plug interface; 5. Top cover plate; 5.1. Top plate; 5.2. Bottom plate; 5.3. Vertical side plate; 6. Filter screen; 7. Positioning block; 8. Slide slot 1; 9. Slide bar 1; 10. Sliding block; 11. Cleaning plate; 12. Brush; 13. Limiting circular hole; 14. Control motor; 15. Rotating column; 16. Guide groove; 17. Roller follower; 18. Extrusion Pressure chamber; 19, piston plate; 20, oblique plate; 21, air bag; 22, air groove; 23, return spring; 24, limit strip; 25, control chamber; 26, rotating handle; 27, rotating rod; 28, control gear; 29, slide groove 2; 30, slide rod 2; 31, moving block; 32, rack plate; 33, fixing hole; 34, plug-in rod; 35, handle; 36, observation window; 37, collection box; 38, cleaning port. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the invention clearer, the present invention is further described below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, a ventilation device for HVAC is provided, including a pipe 1, a mounting plate 2 is fixedly connected to the left and right sides of the pipe 1, a fan assembly 3 is arranged inside the two mounting plates 2, a through-type plug-in port 4 is opened on the inner upper surface of the pipe 1, a top cover plate 5 is arranged inside the plug-in port 4, and the top cover plate 5 is used to block the top surface opening of the plug-in port 4. Figure 2 and Figure 5 As shown, the lower surface of the top cover plate 5 is fixedly connected with a filter screen 6, the lower surface of the filter screen 6 is in contact with the inner lower surface of the pipe 1, the inner lower surface of the pipe 1 and the left and right sides of the filter screen 6 are fixedly connected with a positioning block 7, or the positioning block 7 is only fixedly connected to the right side of the filter screen 6, and the upper surface of the positioning block 7 located on the right side of the inner side of the pipe 1 is provided with a slide groove 8, which is a long strip-shaped groove arranged on the positioning block 7, the inner front surface and the inner rear surface of the slide groove 8 are fixedly connected with a slide bar 9, and the outer side wall of the slide bar 9 is slidably connected with a slide block 10, which is sleeved on the slide bar 9 and can move back and forth along the slide bar 9. The upper surface of the slide block 10 is fixedly connected with a cleaning plate 11, the upper surface of the cleaning plate 11 is slidably connected with the inner upper surface of the pipe 1, or the upper surface of the cleaning plate 11 is in contact with the inner upper surface of the pipe 1, and when the sliding block 10 moves back and forth along the slide bar 9, the cleaning plate 11 moves back and forth in the inner side of the pipe 1 synchronously.

[0030] A brush 12 is fixedly connected to the left side of the cleaning plate 11 . A through-type limiting circular hole 13 is opened on the front surface of the cleaning plate 11 . The limiting circular hole 13 penetrates from the front surface of the cleaning plate 11 to the back side of the cleaning plate 11 . The rotating column 15 passes through the limiting circular hole 13 .

[0031] like Figure 1 and Figure 4 As shown, the front surface of the pipe 1 is fixedly connected with a control motor 14, the rear end of the output shaft of the control motor 14 extends into the interior of the pipe 1, and the rear end of the output shaft of the control motor 14 is fixedly connected with the front end of the rotating column 15, the outer side wall of the rotating column 15 is integrally formed with a continuous guide rail groove 16, the rear end of the rotating column 15 passes through the limiting circular hole 13, and the control motor 14 drives the rotating column 15 to rotate. In a specific embodiment, a groove or a protruding cylinder can be set on the inner rear surface of the pipe 1, the rear end of the rotating column 15 passes through the limiting circular hole 13 and extends into the groove or the protruding cylinder, and the rear end of the rotating column 15 is gap-matched with the groove or the protruding cylinder.

[0032] A roller follower 17 is fixedly connected to the inner lower surface of the limiting circular hole 13 , and the upper surface of the roller follower 17 is in contact with and connected to the inner side wall of the guide rail groove 16 .

[0033] When in use, the fan assemblies 3 on both sides are started, and the airflow generated by the fan assemblies 3 passes through the pipe 1. The air enters from the right side of the pipe 1, and passes through the filter 6 to intercept dust, impurities, etc. in the air. The filtered clean air flows out from the left side of the pipe 1 and enters the indoor space or other parts of the air-conditioning system to provide clean air for the room. As time goes by, dust will gradually accumulate on the outside of the filter 6, which will cause the filtering efficiency of the filter 6 to gradually decrease, and the resistance of air passing through the filter 6 will also increase. At this time, the start-up of the control motor 14 can be regularly driven by the program, and the control motor 14 can be driven to rotate forward or reverse according to the set frequency. As the column 15 rotates, the guide groove 16 on the rotating column 15 rotates together with the rotating column 15, and the roller follower 17 is restricted by the limiting circular hole 13 on the cleaning plate 11, so the roller follower 17 can only slide relative to the guide groove 16. The continuous shape design of the guide groove 16 can make the roller follower 17 produce a forward and backward displacement during the rotation of the rotating column 15, and the rotation of the rotating column 15 is converted into a linear motion of the cleaning plate 11. The rotation of the rotating column 15 can drive the cleaning plate 11 and the brush 12 to move forward and backward to comprehensively clean the entire filter screen 6, thereby improving the efficiency of dust filtration.

[0034] like Figure 2 As shown, a collecting box 37 is fixedly connected to the lower surface of the pipe 1, the upper surface of the collecting box 37 extends to the right side of the filter screen 6, and a cleaning port 38 is provided on the lower surface of the collecting box 37;

[0035] The collection box 37 can effectively collect the dust cleaned by the brush 12, ensuring that the dust will not enter the airflow in the pipe 1 again, thereby effectively avoiding secondary pollution. At the same time, the dust accumulated in the collection box 37 can be cleaned by regularly opening the cleaning port 38, thereby improving the convenience of the device. In the prior art, an openable vent is usually provided on the air conditioning ventilation duct, and the openable vent near the collection box 37 is manually opened regularly, and the dust accumulated in the collection box 37 is manually cleaned into the cleaning port 38. The cleaning port 38 is a dust collection bucket, and an annular snap ring is provided on the cleaning port 38. A hook is provided at the end of the collection box 37, and the annular snap ring is hung on the hook, so that the cleaning port 38 can be conveniently installed on the collection box 37, or the cleaning port 38 can be removed from the collection box 37.

[0036] like Figure 8 As shown, in a specific embodiment, the top cover plate 5 includes a top plate 5.1 and a bottom plate 5.2. There are two symmetrically arranged vertical side plates 5.3 between the top plate 5.1 and the bottom plate 5.2, each of which is arranged along the length direction of the top cover plate 5, and the outer bottom surface of the bottom plate 5.2 is connected to the filter screen 6. The two vertical side plates 5.3, the top plate 5.1, and the bottom plate 5.2 are connected to form a control chamber 25 located inside the top cover plate 5, the vertical side plate 5.3 located on the left side is the left side surface of the control chamber 25, and the vertical side plate 5.3 located on the right side is the right side surface of the control chamber 25.

[0037] like Figure 1 , Figure 3 and Figure 6 As shown, a rotating handle 26 is provided on the upper surface of the top cover plate 5, and a rotating rod 27 is fixedly connected at the center of the lower surface of the rotating handle 26. The lower part of the rotating rod 27 is located in the control cavity 25, that is, the lower part of the rotating rod 27 is located in the rectangular top cover plate 5. The bottom end of the rotating rod 27 is rotatably connected to the inner lower surface of the control cavity 25, that is, the inner lower surface of the top cover plate 5 through a rotating shaft. It can be that a protruding cylinder is provided on the bottom surface of the rotating rod 27, a groove is provided on the bottom surface of the top cover plate 5, and the protruding cylinder on the bottom surface of the rotating rod 27 extends into the groove, and the protruding cylinder and the groove are in clearance; or a protruding cylinder is provided on the bottom surface of the top cover plate 5, and the bottom end of the rotating rod 27 extends into the protruding cylinder, and the bottom end of the rotating rod 27 and the protruding cylinder are in clearance. When the rotating handle 26 is turned, the rotating rod 27 can rotate.

[0038] A control gear 28 is fixedly connected to the outer side wall of the rotating rod 27 . The control gear 28 is sleeved on the rotating rod 27 . The control gear 28 is located inside the control cavity 25 .

[0039] The control chamber 25 has two slide grooves 29 on its left side and right side. The two slide grooves 29 are long strip grooves on the left side and right side of the control chamber 25. The long strip grooves are arranged along the length direction of the left side and right side. The two slide grooves 29 have two slide bars 30 fixedly connected to their inner front surfaces and inner rear surfaces. The two slide bars 30 have two moving blocks 31 slidably connected to their outer side walls. The two moving blocks 31 have rack plates 32 fixedly connected to their opposite sides. The two rack plates 32 are meshedly connected to the outer side wall of the control gear 28 on their opposite sides.

[0040] In a specific embodiment, the front and back of the control cavity 25 can be set as an opening or a semi-enclosed opening. The front and back surfaces of the plug port 4 are both provided with fixing holes 33, and the ends of the two rack plates 32 away from the control gear 28 are fixedly connected to the plug rods 34, and the opposite ends of the two plug rods 34 extend to the inside of the two fixing holes 33 respectively.

[0041] When the filter screen 6 needs to be cleaned or maintained later, the rotating handle 26 can be rotated to drive the rotating rod 27 to rotate. The rotating rod 27 controls the two rack plates 32 to slide relative to each other through the control gear 28, so that the two plug-in rods 34 can be pulled out of the two fixing holes 33, and the filter screen 6 can be pulled out as a whole by pulling the top cover plate 5 upwards, thereby increasing the maintainability of the device. At the same time, the movement direction of the moving block 31 is limited by the provided sliding groove 29 and sliding rod 20, so that it can only slide along the axial direction of the sliding rod 20, thereby ensuring the linearity and stability of the rack plate 32 during the movement, increasing the stability of the device. When installing the filter screen 6, after the filter screen 6 is plugged into the inside of the pipe 1, the two plug-in rods 34 can be plugged into the inside of the two fixing holes 33 by rotating the rotating handle 26 in the opposite direction, thereby completing the fixation of the filter screen 6.

[0042] like Figure 7 and Figure 8As shown, two extrusion chambers 18 are arranged inside the top cover plate 5, and the control chamber 25 is located between the two extrusion chambers 18, and the two extrusion chambers 18 are respectively located on the left and right sides of the control chamber 25. The interiors of the two extrusion chambers 18 are both slidably connected with piston plates 19, and the two piston plates 19 are respectively located on the left and right sides of the control chamber 25, one piston plate 19 is located on the outside of the left side of the control chamber 25, and the other piston plate 19 is located on the outside of the right side of the control chamber 25. A return spring 23 is arranged between each piston plate 19 and the left side or outer side of the control chamber 25, and the top surface of the piston plate 19 is in clearance with the top surface inside the top cover plate 5, and the bottom surface of the piston plate 19 is in clearance with the bottom surface inside the top cover plate 5. When the return spring 23 is extended or compressed, the piston plate 19 can move back and forth with the extension or compression of the return spring 23, and the piston plate 19, the internal top surface of the top cover plate 5, the internal bottom surface of the top cover plate 5, and the left side or right side of the control chamber 25 form a closed extrusion chamber 18.

[0043] The left side or the right side of the top cover plate 5 may be a semi-enclosed opening, that is, the top surface of the left side or the right side of the top cover plate 5 is at a certain distance from the top plate 5 . 1 of the top cover plate 5 .

[0044] The opposite sides of the two piston plates 19 are fixedly connected with an oblique plate 20. Since the left side or the right side of the top cover plate 5 can be a semi-closed opening, the top surface of the left side or the right side of the top cover plate 5 is a certain distance away from the top plate 5.1 of the top cover plate 5. One end of the oblique plate 20 can extend from the opening between the top surface of the left side or the right side of the top cover plate 5 and the top plate 5.1 to the inner side wall of the plug-in port 4, so that the opposite sides of the two oblique plates 20 are in contact with the inner side wall of the plug-in port 4, and the outer side walls of the left side and the right side of the top cover plate 5 are fixedly connected with two air bags 21, and the air bags 21 can be fixed to the outer side wall of the top cover plate 5 by a screw machine mounting base. The inner lower surfaces of the two extrusion chambers 18 are respectively connected to the two air bags 21 with air grooves 22, the outer side walls of the two air bags 21 are in contact with the inner side walls of the plug-in port 4, one end of the air groove 22 passes through the lower part of the piston plate 19 and extends into the space between the piston plate 19 and the vertical side plate 5.3, that is, extends into the extrusion chamber 18, and the other end of the air groove 22 is connected to the air bag 21.

[0045] When the top cover plate 5 is installed, the compression spring 23 is compressed by the squeezing of the inclined surfaces of the two oblique plates 20 and the plug-in port 4, and then the two piston plates 19 slide relative to each other, so that the airflow inside the extrusion chamber 18 is transported to the inside of the two air bags 21 through the two air grooves 22. The two air bags 21 are charged and collided with gas, and the air bags 21 expand and contact closely with the inner wall of the plug-in port 4 to form a seal, which can effectively prevent the airflow from leaking to the outside through the plug-in port 4, ensure the comprehensiveness and reliability of the device sealing, and protect the overall structure of the ventilation device. When it is necessary to pull out the top cover plate 5, cancel the lock on the top cover plate 5 and pull the top cover plate 5 hard to take it out.

[0046] like Figure 7 As shown, the two piston plates 19 are fixedly connected with the two extrusion chambers 18 on opposite sides thereof with reset springs 23; when the top cover plate 5 is pulled out, the two inclined plates 20 can be reset by the rebound of the reset springs 23, and the device can be reused, thereby improving the practicality of the device.

[0047] like Figure 7 As shown, the inner upper and lower surfaces of the two extrusion chambers 18 and the opposite sides of the two piston plates 19 are fixedly connected with limiting strips 24; the setting of the limiting strips 24 can effectively limit the moving distance of the two piston plates 19, that is, the moving distance of the two oblique plates 20 can be limited by the two piston plates 19, avoiding the distance between the piston plate 19 and the vertical side plate 5.3 being too small, ensuring that the airflow can be delivered to the interior of the two air bags 21 through the two air grooves 22, and further ensuring the reliability of the sealing of the device.

[0048] like Figure 1 As shown, an observation window 36 is provided on the front surface of the pipe 1. The observation window 36 is a glass window. The observation window 36 allows the operator to directly observe the real-time internal status of the pipe 1 during the operation of the equipment, and can observe the degree of dust adhesion on the outside of the filter 6.

[0049] like Figure 1 As shown, handles 35 are fixedly connected to the upper surface of the top cover plate 5 and are located in front and behind the rotating handle 26. The two handles 35 allow operators to perform operations such as disassembly and installation of the filter screen 6, thereby improving the convenience and efficiency of operation.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A ventilation device for heating, ventilation and air conditioning, comprising a duct (1), characterized in that: The upper surface of the pipe (1) is provided with a through-type plug-in port (4), the plug-in port (4) is movably connected to a top cover plate (5) inside, the top cover plate (5) is used to block the plug-in port (4), the lower surface of the top cover plate (5) is connected to a filter screen (6), the lower surface of the filter screen (6) is in contact with the lower surface of the pipe (1), a cleaning plate (11) is movably connected inside the pipe (1), a brush (12) is provided on a side of the cleaning plate (11) facing the filter screen (6), and when the cleaning plate (11) moves back and forth inside the pipe (1), the brush (12) contacts the filter screen (6) to clean the filter screen (6).

2. A ventilation device for HVAC according to claim 1, characterized in that: A positioning block (7) is provided on the inner lower surface of the pipe (1) and on one side of the filter screen (6); a slide groove (8) is provided on the upper surface of the positioning block (7); the inner front surface and the inner rear surface of the slide groove (8) are commonly connected to a slide rod (9); the slide block (10) is movably sleeved on the slide rod (9); a cleaning plate (11) is fixedly connected to the upper surface of the slide block (10); the upper surface of the cleaning plate (11) is slidably connected to the inner upper surface of the pipe (1); a brush (12) is fixedly connected to the left side of the cleaning plate (11); and a through-type limiting circular hole (13) is provided on the front surface of the cleaning plate (11).

3. A ventilation device for HVAC according to claim 1, characterized in that: The front surface of the pipe (1) is connected to a control motor (14), the rear end of the output shaft of the control motor (14) is connected to the front end of a rotating column (15), the outer wall of the rotating column (15) is integrally formed with a guide rail groove (16), the rear end of the rotating column (15) passes through the limiting circular hole (13), the inner lower surface of the limiting circular hole (13) is fixedly connected to a roller follower (17), and the upper surface of the roller follower (17) is in contact with the inner wall of the guide rail groove (16).

4. A ventilation device for HVAC according to claim 1, characterized in that: The top cover plate (5) is provided with an extrusion chamber (18) on the left and right sides of the interior, and the interiors of the two extrusion chambers (18) are slidably connected to piston plates (19), and the opposite sides of the two piston plates (19) are fixedly connected to oblique plates (20), and the opposite sides of the two oblique plates (20) are in contact with the inner side walls of the plug interface (4). The outer side walls of the top cover plate (5) are fixedly connected to two air bags (21), and the inner lower surfaces of the two extrusion chambers (18) are respectively connected to the two air bags (21) through air grooves (22), and the outer side walls of the two air bags (21) are in contact with the inner side walls of the plug interface (4).

5. A ventilation device for HVAC according to claim 4, characterized in that: Reset springs (23) are connected between the opposite sides of the two piston plates (19) and the two extrusion chambers (18).

6. A ventilation device for HVAC according to claim 4, characterized in that: The inner upper surface and the lower surface of the two extrusion chambers (18) and the opposite sides of the two piston plates (19) are connected to the limiting strips (24).

7. A ventilation device for HVAC according to claim 4, characterized in that: A control chamber (25) is provided inside the top cover plate (5) and between the two extrusion chambers (18); a rotating handle (26) is provided on the upper surface of the top cover plate (5); a rotating rod (27) is fixedly connected to the center of the lower surface of the rotating handle (26); the bottom end of the rotating rod (27) is rotatably connected to the lower surface of the control chamber (25) via a rotating shaft; a control gear (28) is fixedly connected to the outer wall of the rotating rod (27); a second slide groove (29) is provided on the left and right sides of the control chamber (25); the inner front surfaces and the inner rear surfaces of the two slide grooves (29) are respectively The surfaces are commonly connected with a sliding rod 2 (30), a moving block (31) is movably sleeved on the sliding rod 2 (30), opposite sides of the two moving blocks (31) are fixedly connected with a rack plate (32), opposite sides of the two rack plates (32) are meshed with the outer side walls of the control gear (28), the inner front surface and rear surface of the plug interface (4) are provided with fixing holes (33), the ends of the two rack plates (32) away from the control gear (28) are fixedly connected with a plug-in rod (34), and the opposite ends of the two plug-in rods (34) extend to the inside of the two fixing holes (33) respectively.

8. A ventilation device for HVAC according to claim 7, characterized in that: A grip (35) is fixedly connected to the upper surface of the top cover plate (5) and located in front of and behind the rotating handle (26).

9. A ventilation device for HVAC according to claim 1, characterized in that: The front surface of the pipe (1) is provided with an observation window (36).

10. A ventilation device for HVAC according to claim 1, characterized in that: A collecting box (37) is fixedly connected to the lower surface of the pipe (1), the upper surface of the collecting box (37) extends to the right side of the filter screen (6), and the lower surface of the collecting box (37) is provided with a cleaning port (38).

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